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Old 12-26-2009, 10:42 PM   #1
crashbumper
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Default Bluepoint AT325C 3/8" impact teardown and rebuild.

Yesterday I got a Bluepoint AT325C 3/8" impact.

There was some deep grooving on one side (looks like from a grinding wheel?) and quite a bit of gunk clogging up the built in filter.

I decided to pull it all apart to clean it up, polish it and make it look all pretty before I use it.

As I've mentioned in other posts, this is something I prefer to do for fun; functionally this gun was ok. I just wanted it to look nice.

On with the photobomb!



Start:





Deep grooving:





Rear housing comes off with four 4mm allen bolts:



Remove the end cap:



Removing the rotor:



Removing the reversing pin:



Reversing pin assembly (along with the screws that hold in the detent):



Hammer & Anvil assembly (where the actual impacting comes from):



Disassembling the hammer assembly:











Removing the air regulator assembly (after driving out the roll pin):




Here's a handy method for polishing up smaller round pieces:



A light touch of scoth brite to remove the surface rust, and some polish:



Cleaning up the grooving with a 3" surface pad:



After some sanding with abrasive sponges and 800 grit:



It's looking pretty good so far. I'm going to go over the housing some more with finer sandpaper to really clean it up before I polish it tomorrow.

Thanks for stopping by!

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Old 12-26-2009, 10:50 PM   #2
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

by polishing the insides does that give it back its power? i "rebuilt" an IM6500 because it had a broken hammer but it seems like it doesn't have nearly as much power as it should.
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Old 12-26-2009, 11:01 PM   #3
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Quote:
Originally Posted by Joelfke View Post
by polishing the insides does that give it back its power? i "rebuilt" an IM6500 because it had a broken hammer but it seems like it doesn't have nearly as much power as it should.
Well, I'm just polishing up things like the air regulator and reversing pin. There is some scoring inside the rotor which you can see in the above pics. I would think that heavy scoring would cause some loss of performance; but "heavy" is open to interpretation.

I don't anticipate any gains in performance, but maybe smoother and quieter.
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Old 12-26-2009, 11:28 PM   #4
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

I like it! I would say get a brake caliper cylinder hone (Break it in first) and polish up the inside of the rotor, first with the hone then with some fine abrasive. Next, clean up the edges of the vanes,keeping them all equal for balance. Should restore Lost power. Don't forget about seals and gastets. Cool project
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Old 12-26-2009, 11:32 PM   #5
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Dang, that's a good idea using a brake hone! I may just do that. The vanes do have ridges where they have worn in.

Thanks!
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Old 12-26-2009, 11:56 PM   #6
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

hmm...i wonder if replacing the vanes on mine would increase power...hmm...nice project nonetheless crashbumper
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Old 12-27-2009, 12:07 AM   #7
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.U

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Originally Posted by Joelfke View Post
hmm...i wonder if replacing the vanes on mine would increase power...hmm...nice project nonetheless crashbumper
If they have ridges then yes it might, bit it would also require that the inside sutface of the motor be smooth As well. The original poster may be better off ordering new ones, As it would be difficult to both keep the edges perfectly flat and square with the ends, but also to maintain balance which could result in vibrAtion. More critical in a sander or grinder, buy still an unwanted side effect of badly out of balanced blades. In this application, it would likely
be masked by
the impacting. Just a thought.
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Old 12-27-2009, 06:54 AM   #8
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Great to see someone make a DIY for the "rear cap" style of impact guns. I did my IR231-style DIY a few months back. If you try to rebuild those, be careful to put the rotor back in straight!

Last edited by peter_x; 12-27-2009 at 06:57 AM.
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Old 12-27-2009, 04:50 PM   #9
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Got the housing polished, definitely looks better.







Also, picked up a brake cylinder hone and cleaned up the scoring on the rotor housing.



Cleaned up rotor:





Reversing pin installed (much smoother now):




Good as new!





This one was fun; I hope I score another air tool in need of a rebuild.
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Current WTB: Pink 3/8" Snap-On ratchet (F836?) for daughter.

Money Pits:
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1969 VW Bug (Cal-Look)
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Old 12-27-2009, 05:04 PM   #10
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

looks good
I have rebuild many air tools and to me it looks like you have done everything right.
there may be some benifit to new vanes, but most of the time I would reuse the old ones after a little sanding on the sides and contact edge.
be sure to bevel the sides of the contact face a bit or sand them with a little bit of a crown to reduce the surface friction

bob
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Old 09-26-2010, 10:57 AM   #11
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

hey i got a question guys. you know where i could get new parts for mine. the two pins in the hammer i need the most. it runs great but i broke one of the pins on the hammer. and very nice rebuild. looks good! maybe i will do it to
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Old 09-26-2010, 04:27 PM   #12
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

If you look at your 3rd picture you can just barely see the marks from a engraver. It had its owners mark adjusted.

Eww old post
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Old 09-26-2010, 07:12 PM   #13
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

You buffed out those gouges with a brillo pad set on high? Wow! Nice job!
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Old 09-26-2010, 08:44 PM   #14
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

I am looking into doing this with an IR i found in a pawn shop closeout bin for $5. Mine looks to be a lot more heavily used and is damaged at the moment. Thanks for the pics though!

-Dane
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Old 09-27-2010, 04:06 AM   #15
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

nice pics !!
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Old 12-27-2010, 10:16 PM   #16
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Great job on the rebuild. Thanks for posting.

I have one that is running a bit weak, so would like to rebuild it.

I found some parts still available at Snap-On:

http://buy1.snapon.com/catalog/parts...&group_id=5738

Anyone else know where parts might be available?

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Old 12-28-2010, 09:21 AM   #17
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

i replaced a hammer pin in my im31 impact not long ago. works good. now i will probably pawn it and buy a new ingersoll rand
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Old 12-28-2010, 10:11 AM   #18
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Great write-up! I've a couple of impact that could use a refresh like this.
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Old 01-06-2011, 09:51 PM   #19
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Well.....the regulator assembly was stuck in mine. I tried to turn it with pliers and it snapped off also found a busted hammer pin inside.

If anyone wants a parts gun cheap, send me a PM.
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File Type: jpg impact.jpg (59.4 KB, 48 views)
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Old 06-23-2013, 04:44 PM   #20
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Default Re: Bluepoint AT325C 3/8" impact teardown and rebuild.

Subscribed....
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